Problem:
If log7​(log3​(log2​x))=0, then x−1/2 equals
Answer Choices:
A. 31​
B. 23​1​
C. 33​1​
D. 42​1​
E. none of these
Solution:
log7​(log3​(log2​x))=0​⇒log3​(log2​x)=1⇒log2​x=3⇒x=23=8​
So x−1/2=8​1​=22​1​.